Method for increasing mechanical strength of titanium alloys having α″ phase by cold working
First Claim
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1. A process for making an article of a titanium alloy having α
- ″
phase as a major phase comprising the following steps;
a) providing a work piece of a titanium-molybdenum alloy having α
″
phase as a major phase; and
b) cold working at least a portion of said work piece at room temperature once or repeatedly to obtain a green body of said article, wherein the resultant cold worked portion of said green body has an average thickness which is 10%-90% of an average thickness of before cold working said at least a portion of said work piece, and the cold worked portion has α
″
phase as a major phase,wherein said cold working in step b) is either carried out once and the resultant cold worked portion of said green body has an average thickness which is 50%-90% of an average thickness of said at least a portion of said work piece;
orsaid cold working in step b) is carried out repeatedly and each time of said repeated cold working results in a reduction of an average thickness of the cold worked portion being less than about 40% wherein the titanium-molybdenum alloy in step a) consists essentially of about 7.5 wt % of molybdenum and the balance titanium; and
wherein said cold worked portion resulted from step b) has α
″
phase as a major phase and α
′
phase as a minor phase.
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Abstract
A process for making an article of a titanium alloy having α″ phase as a major phase according to the present invention includes providing a work piece of a titanium alloy consisting essentially of 7-9 wt % of molybdenum and the balance titanium and having α″ phase as a major phase; and cold working at least a portion of the work piece at room temperature to obtain a green body of the article, wherein the cold worked portion of the green body has a thickness which is 20%-80% of that of the at least a portion of the work piece, and the cold worked portion has α″ phase as a major phase.
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Citations
12 Claims
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1. A process for making an article of a titanium alloy having α
- ″
phase as a major phase comprising the following steps;a) providing a work piece of a titanium-molybdenum alloy having α
″
phase as a major phase; andb) cold working at least a portion of said work piece at room temperature once or repeatedly to obtain a green body of said article, wherein the resultant cold worked portion of said green body has an average thickness which is 10%-90% of an average thickness of before cold working said at least a portion of said work piece, and the cold worked portion has α
″
phase as a major phase,wherein said cold working in step b) is either carried out once and the resultant cold worked portion of said green body has an average thickness which is 50%-90% of an average thickness of said at least a portion of said work piece;
orsaid cold working in step b) is carried out repeatedly and each time of said repeated cold working results in a reduction of an average thickness of the cold worked portion being less than about 40% wherein the titanium-molybdenum alloy in step a) consists essentially of about 7.5 wt % of molybdenum and the balance titanium; and
wherein said cold worked portion resulted from step b) has α
″
phase as a major phase and α
′
phase as a minor phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification